Abstract
Hoya longlingensis (E.F. Huang) and H. sichuanensis E.F. Huang are two new species of Apocynaceae from Southwestern China that are described in this study. Morphologically, the two species resemble H. tamdaoensis Rodda & T.B. Tran and H. lyi H. Lév., respectively. However, H. longlingensis differs from H. tamdaoensis by its elliptic leaves, mid-vein of leaf blades raised adaxially and depressed abaxially, lateral veins 2–4-paired, corolla yellow-green, outer angles of corona convex and spreading outside obviously. While H. sichuanensis differs from H. lyi by its obovate leaves, leaf apex rounded and base cuneate, petioles 1–3.5 cm long and ca. 3 mm in diameter, calyx lobes triangular, and corona whitish.
Highlights
Br. is a large genus in the tribe Marsdenieae, subfamily Asclepiodoideae of Apocynaceae [1], with more than 300 species distributed from China and Southeast Asia to Oceania [1,2], and 32 species were recorded in Flora of China [2]
Many new species of this genus were reported from the adjacent areas of China [12,13,14,15,16,17,18,19,20]
After detailed morphological comparisons among congeneric species recorded from China and adjacent areas, it was concluded that the two species were new to science, they were formally described below
Summary
Diagnosis: The species is morphologically similar to Hoya tamdaoensis Rodda & T.B. Tran, but differs by its elliptic-shaped leaves, mid-vein of leaf blades raised adaxially and depressed abaxially, lateral veins of leaf blades 2–4-paired, corolla yellow-green, outer angles of corona convex and spreading outward obviously. Hoya longlingensis is known only from its type locality, Longling Hsien, Yunnan Province, China (Figure 4).
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